Ok, I like Mercedes as much as the next guy but "beat an M3 on a track"???? Now that's just dopey. I'll leave the X5M thing alone. It's a fast truck that handles well for a truck, but it's a truck. Not sure this is the best way to approach your enthusiasm.

Until we see some real world numbers whcih car is faster on a track is a matter of speculation.

And don't underestimate what a truck can do until you have ridden arround a track in a Porsche Cayenne Turbo with a professional driver at the wheel.